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1 # -*- coding: utf-8 -*-
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2
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3 """
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4 data models
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5 """
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6
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21
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7 from collections import OrderedDict
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8
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9 __all__ = ['Rows', 'Columns']
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10
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11
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12 class ColumnNumberException(Exception):
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13 """
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14 wrong number of columns: {given} given; {expected} expected
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15 """
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16 def __init__(self, given, expected):
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17 self.given = given
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18 self.expected = expected
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23
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19 Exception.__init__(self.__doc__.format(**self.__dict__).strip())
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20
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21
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22 class ColumnLengthException(ColumnNumberException):
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23 """
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24 wrong length of column: {given} given; {expected} expected
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25 """
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26 # XXX should share ABC, not inherit from ColumnNumberException
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21
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27
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28
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29 class Rows(object):
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30 """
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31 row-based data
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32 """
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33
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34 array = OrderedDict
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19
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35
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36 def __init__(self, columns, *rows):
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37 """
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38 columns -- column labels
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39 """
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40 self.column_names = columns
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41 self.rows = []
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42
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43 for row in rows:
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44 self += row
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45
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46 def __iadd__(self, row):
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47 """add a labeled row"""
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48 if len(row) != len(self.columns_names):
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49 raise ColumnNumberException(len(row), len(self.columns_names))
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50 self.rows.append(self.array(zip(self.columns_names, row)))
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51
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52 def __len__(self):
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53 return len(self.rows)
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54
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55 def __getitem__(self, item):
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56 return self.rows[item]
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22
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57
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58
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59 class Columns(object):
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60 """
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61 column-oriented data
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62 """
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63
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64 def __init__(self, *columns):
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65 self.columns = OrderedDict() # this should be ordered
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23
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66 for name, values in columns:
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67 self += (name, values)
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68
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69 def __iadd__(self, item):
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70 column_name, values = item
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71 assert column_name not in self.columns
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72
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73 return self
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